This is actually a pretty clever move by Maersk! It might not be a very polite thing to do, but by doing this, they aren't cutting their own food chain - they are forcing the Danish Maritime Authority into allowing foreign captains on danish ships. Because in ten years when they run short on danish seniors, they can say "either you allow us to use foreign captains, or we'll be forced to move our ships to foreign flags" and the danish government don't want to loose the money these ships bring in!
I just finished my education in Svendborg a few months ago and was employed with Maersk as a cadet, but chose to find a job elsewhere because I was suspecting something like this would happen! Today, Henrik Sloth the HR-something for Maersk was in Svendborg to talk to the maersk-employed cadets and told them that they expected them to find employment elsewhere as maersk wouldn't offer them employment on their ships!
The worst thing about this though is that I have a letter from Maersk from two years ago when they tried to sack all the danish chief stewards and ABs saying that there was no need to worry as maersk was always going to need "competent danish officers"... Until they got a new CEO who doesn't care about corporate citizenship and responsibility, but only care about profits...
Anyway, Good thing I got out before all this BS happened!